Partition coefficient phenocryst/matrix

Philpotts A. R. (1979). Silicate immiscibility in tholeiitic basalts. J. Petrol, 20 99-118. Philpotts I A. and Schnetzler C. C. (1970). Phenocryst-matrix partition coefficients for K, Rb,... 

Dale and Henderson (1972) investigated trace element distribution in phenocrysts (olivine, pyroxene) and basalt matrix, with much consideration of crystal field effects. Banno and Matsui (1973) published a new formulation of partition coefficients for trace element distribution between minerals and magmas, based on the concept of chemical potentials for liquids and crystals. 

Philpotts, J. A., Schnetzler, C. C. Phenocryst-matrix partition coefficients forK, Rb, Sr and Ba with application to anorthosite and basalt genesis. Geochim. et Cosmochim. 

Partition In Table 4.1 partition coefficients are listed for trace elements in minerals In coejficients in equilibrium with basaltic and basaltic andesite liquids. Following the TAS basalts and classification these are liquids with silica contents in the range 45 57 wt %. A basaltic andesites summary of the REE partition coefficients is presented in Figure 4.8 as a plot of partition coefficient vs atomic number. The compilation in Table 4.1 is based upon a variety of published sources from experimental and phenocryst/matrix data. Averages are arithmetic means. 

Schnetzler C.C. and Philpotts J.A., 1970, Partition coefficients of rare earth elements between igneous matrix material and rock-forming mineral phenocrysts — n. Geochim. Cosmochim, Acta, 34, 331—340. 

Leeman [80] has measured sanidine/liquid and plagio-clase/liquid partition coefficients for Pb, using the phenocryst-matrix technique. PlagioclaseAiquid partition coefficients increase from 0.1 to 0.7 as melt composition changes from basaltic to rhyolitic. Sanidine/liquid partition coefficients for Pb are near unity. 

Measuring Partition coeffidents can be determined in natural systems from the analysis of partitidn minerals and their glassy matrix in rapidly cooled volcanic rocks. Provided suffident coefficients care is given to obtaining a clean mineral separate from unzoned minerals and a suffidently sensitive analytical technique is used, mineral/matrix or phenocryst/... 

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